Clarence l



(No Model.)

O. L. HEALY.

PRINTING TELEGRAPH. No. 407,729. Patented July 23, 1889.

UNITED STATES PATENT OFFICE- CLARENCE L. HEALY, OF BROOKLYN, ASSIGN ORTO THE COMMERCIAL TELE- GRAM COMPANY, OF NEYV YORK, N. Y.

PRlNTlNG-TELEG RAPH.

SPECIFICATION forming part of Letters Patent No. 407,729, dated' July23, 1889.

Application filed November 28, 1887. Serial No. 256,313. (No model.)

To all whom it may concern: employed to absorb the spark at the pointsat Be it known thatI, CLARENCE L. HEALY, of which the printing-relaycircuit is broken. Brooklyn, in the county of Kings and State of Theaccompanying drawing, forming a part New York, have invented a certainnew and hereof, shows principally in diagram enough useful Improvementin Printing-Telegraphs, of the parts of a printing-telegraph transmitofwhich the following is a specification. ter for the understanding of myinvention.

In operating printing-telegraphsit has been A is the key-board, B thesunflower, C the found desirable, in order to attain the maxicylinder,and I) the clutchmagnet, of the mum speed and produce the best copy, totransmitter.

o short-circuit the relays controlling the print- E represents theprinting-relays, each coning-circuits bya magnetacting with theprinttrolling a printing-circuit L. The circuit 1 ing-circuit relays, sothat the printingcircuits from the dynamo F passes through the breakwillbe opened immediately independent of ing-points a, controlled by therepeat-key b the transmitting-operator, and only moment at the keyboard,through the front contact- I 5 ary current impulses will traverse thesecirpoint and armature-lever c of a magnet G in cuits, as described inpatent to Stephen D. the transmitter key-board or operating-cir- Field,numbered 290,556. cuit 2, and through the coils of the magnet II,

In applying this device to a number of to the spring d of thecontinuity-preserving printing-circuit relays with a shunt common leverI. From the body of the lever I the I 20 to all of such relays thecutting out of circuit branch 3, including the printing-relays, is 7c ofa resistance so considerable as that offered taken, this branch beingmade a part of the by the numerous relays produced a largelycircuit 1,when the spring (1 touches the hookincreasedandinjuriousflowofcurrentthrough e of the lever. lVith, thecircuit-point fis the local circuit, so that when the repeat keyconnected a branch at, including an artificial 25 is used to open andclose this circuit for reresistance R, which may be the same or peatingthe breaking-points are injured or greater than the resistance of theprintingdestroyed by the current. In my patent, No[ relays. The lever Iis acted on by a magnet 365,994, I overcome this difficulty by the useK, which is in a local circuit controlled by the of three relays whichact to short-circuit the magnet H, as shown. Connected with the 0printing-relays and to introduce an equivarelay branch 3 is a condenserM, which ablent resistance into the circuit; but the appasorbs the sparkwhen the branch 3 is broken. ratus of that patent; while a greatimprove- The printing-relays E and the resistance R ment over that ofthe Field patent, has some form two legs or branches from the circuit 1,objectionable features which it is the object the circuit 1 beingcompleted through the re- 3 5 of this invention to overcome. lays or theresistance, according to the posi- By my present invention, instead ofshunttion of the lever I. Now, it will be seen that ing theprintiug-relaysl open that circuit and when the keyboard circuit 2 isclosed the simultaneously close another circuit with a magnet G willclose the circuit 1, giving ourresistance equal to or greater than thecomrent to the printing-relays. At the same time 40 bined resistance ofthe relays. This is done the magnet II will be energized and will close0 by a continuity-preserving lever acted upon the local circuit,including the magnet K, by a magnet in a local circuit, which localcirwhich will attract the lever I, shifting the cuit is controlled by amagnet in the circuit circuit 1, without breaking it, from theprintcommon to both the printing-relays and the ing-relays to theresistance. The time re- 5 extra resistance. The points controlled byquired to charge the magnets II and K will 5 the repeat-key are in thiscircuit, which is give the printing-relays time to act. If it is furthercontrolled by a magnet in the transdesired to repeat the letter orfigure, the keymitter keyboard or operating-circuit or diboard circuitis kept closed and the repeatrectly by a mechanically-opcratingcircuitkey Z) is depressed with a tap, breaking and 50 controller at thetransmitter. A condenser is again closing the circuit 1. This breakingof I00 the circuit 1 causes the magnet II to open the circuit to themagnet K, which permits the lever I to fall back, shifting the circuitfrom the resistance again to the printing-relays, when the closing ofcircuit 1 Will cause the printing-relays to act and the magnets H and Kwill close in succession, shifting the circuit again to the resistance.

It Will be understood that the resistance R can be made much greaterthan the printingrelays, if desired, since the magnet H Will requireonly a small current to hold its lever on the front point when oncethere.

By arranging the parts to open the relaycircuit and shift to aresistance by a continuity-preserving lever the apparatus is made moreprompt and reliable in action than the apparatus of my patent, No.365,994. It is simpler, the magnets do not require such a niceadjustment, and they are less liable to get out of adjustment.

WVhat I claim is 1. In printing-telegraphs, the combination, with therepeat-key circuit, of a number of printing-circuit relays located in abranch circuit, an artificial resistance located in another branchcircuit, and a circuit-controller shifting the repeat-key circuit fromthe relay branch to the resistance branch, substantially as set forth.

2. ,In printing-telegraphs, the combination, with the repeat-keycircuit, of a number of printing-circuit relays located in a branchcircuit, an artificial resistance located in another branch circuit, anda continuity-preserving lever operated by a magnet and acting to shiftthe repeat-key circuit from the relay branch to the resistance branch,substantially as set forth.

3. In printingtelegraphs, the combination, with the repeat-key circuit,of a number of printing-circuit relays located in a branch circuit, anartificial resistance located in another branch circuit,acircuitcontroller shifting the repeat-key circuit from the relay Ibranch to the resistance branch, and a condenser connected with therelay branch to absorb the spark, substantially as set forth.

4. In printing-telegraphs, the combination, With the repeat-key circuit,of a number of printing-circuit relays located in a branch circuit, anartificial resistance located in another branch circuit,acircuit-controller shifting the repeat-key circuit from the relaybranch to the resistance branch, a magnet controlled by the repeat-keycircuit Working this shifting circuit-controller, and atransmitter-circuit controller controlling the repeat-key circuit,substantially as set forth.

5. In printing-telegraphs, the combination, With the repeat-key circuit,of a number of printing-circuit relays located in a branch circuit, anartificial resistance located in another branch circuit, acircuit-controller shifting the repeat-key circuit from the relay branchto the resistance branch, a magnet controlled by another magnet locatedin the repeat-key circuit Working this shifting circuitcontroller, and atransmitter-circuit controller controlling the repeat-key circuit,substantially as set forth.

6. In printing-telegraphs, the combination, With the repeat-key circuit,of a number of printing-circuit relays located in a branch circuit, anartificial resistance located in another branch circuit, acircuit-controller shifting the repeat-key circuit from the relay branchto the resistance branch, a magnet controlled by another magnet locatedin the repeat-key circuit Working this shifting circuit-controller, anda magnet in the key-board circuit controlling the repeat-key circuit,substantially as set forth.

This specification signed and witnessed this 19th day of November, 1887.

CLARENCE L. l'lEALY.

\Vitnesses: I

OoRNELIUs BLAUVELT, WV. BERRIAN GREENE.

